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Broad Faced Sac Spider

Neoscona crucifera

Photography by: Jenilee Whisler - Central Lake, Michigan

Description – The Broad Faced Sac Spider has a solid colored, darker brown or reddish cephalothorax that is on the shinier side. The abdomen, lacking of any patterns as well, is usually more of a tan or gray color with a smooth but dull sheen to it. One of the most telling signs in identifying the Broad Faced Sac Spider is by the legs. The legs will be tan, brown, or even with a reddish shade to them and the front pair will always be much darker than the back legs.

Size – The body of the adult female will grow to about 3/8 of an inch (10mm). If the legs are included, they can reach approximately 5/8 of an inch (16mm) across.

Web – The Sac Spiders do not spin webs to catch prey. They are nocturnal hunters and during the day they will usually spin a web to create a thin cocoon-like sac to hide in. These are often found in the crease where a wall meets the ceiling or in windowsills.

Bites – The bite of the Broad Faced Sac Spider is initially painful and often produces a painful erythema, similar to that of a bee or wasp sting. Some people who are sensitive to arthropod venom may experience more severe reactions.